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// Copyright 2020 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "test/syscalls/linux/socket_netlink_route_util.h"
#include <linux/if.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include "test/syscalls/linux/socket_netlink_util.h"
namespace gvisor {
namespace testing {
namespace {
constexpr uint32_t kSeq = 12345;
// Types of address modifications that may be performed on an interface.
enum class LinkAddrModification {
kAdd,
kAddExclusive,
kReplace,
kDelete,
};
// Populates |hdr| with appripriate values for the modification type.
PosixError PopulateNlmsghdr(LinkAddrModification modification,
struct nlmsghdr* hdr) {
switch (modification) {
case LinkAddrModification::kAdd:
hdr->nlmsg_type = RTM_NEWADDR;
hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
return NoError();
case LinkAddrModification::kAddExclusive:
hdr->nlmsg_type = RTM_NEWADDR;
hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_EXCL | NLM_F_ACK;
return NoError();
case LinkAddrModification::kReplace:
hdr->nlmsg_type = RTM_NEWADDR;
hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_REPLACE | NLM_F_ACK;
return NoError();
case LinkAddrModification::kDelete:
hdr->nlmsg_type = RTM_DELADDR;
hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
return NoError();
}
return PosixError(EINVAL);
}
// Adds or removes the specified address from the specified interface.
PosixError LinkModifyLocalAddr(int index, int family, int prefixlen,
const void* addr, int addrlen,
LinkAddrModification modification) {
ASSIGN_OR_RETURN_ERRNO(FileDescriptor fd, NetlinkBoundSocket(NETLINK_ROUTE));
struct request {
struct nlmsghdr hdr;
struct ifaddrmsg ifaddr;
char attrbuf[512];
};
struct request req = {};
PosixError err = PopulateNlmsghdr(modification, &req.hdr);
if (!err.ok()) {
return err;
}
req.hdr.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifaddr));
req.hdr.nlmsg_seq = kSeq;
req.ifaddr.ifa_index = index;
req.ifaddr.ifa_family = family;
req.ifaddr.ifa_prefixlen = prefixlen;
struct rtattr* rta = reinterpret_cast<struct rtattr*>(
reinterpret_cast<int8_t*>(&req) + NLMSG_ALIGN(req.hdr.nlmsg_len));
rta->rta_type = IFA_LOCAL;
rta->rta_len = RTA_LENGTH(addrlen);
req.hdr.nlmsg_len = NLMSG_ALIGN(req.hdr.nlmsg_len) + RTA_LENGTH(addrlen);
memcpy(RTA_DATA(rta), addr, addrlen);
return NetlinkRequestAckOrError(fd, kSeq, &req, req.hdr.nlmsg_len);
}
} // namespace
PosixError DumpLinks(
const FileDescriptor& fd, uint32_t seq,
const std::function<void(const struct nlmsghdr* hdr)>& fn) {
struct request {
struct nlmsghdr hdr;
struct ifinfomsg ifm;
};
struct request req = {};
req.hdr.nlmsg_len = sizeof(req);
req.hdr.nlmsg_type = RTM_GETLINK;
req.hdr.nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP;
req.hdr.nlmsg_seq = seq;
req.ifm.ifi_family = AF_UNSPEC;
return NetlinkRequestResponse(fd, &req, sizeof(req), fn, false);
}
PosixErrorOr<std::vector<Link>> DumpLinks() {
ASSIGN_OR_RETURN_ERRNO(FileDescriptor fd, NetlinkBoundSocket(NETLINK_ROUTE));
std::vector<Link> links;
RETURN_IF_ERRNO(DumpLinks(fd, kSeq, [&](const struct nlmsghdr* hdr) {
if (hdr->nlmsg_type != RTM_NEWLINK ||
hdr->nlmsg_len < NLMSG_SPACE(sizeof(struct ifinfomsg))) {
return;
}
const struct ifinfomsg* msg =
reinterpret_cast<const struct ifinfomsg*>(NLMSG_DATA(hdr));
const auto* rta = FindRtAttr(hdr, msg, IFLA_IFNAME);
if (rta == nullptr) {
// Ignore links that do not have a name.
return;
}
links.emplace_back();
links.back().index = msg->ifi_index;
links.back().type = msg->ifi_type;
links.back().name =
std::string(reinterpret_cast<const char*>(RTA_DATA(rta)));
}));
return links;
}
PosixErrorOr<Link> LoopbackLink() {
ASSIGN_OR_RETURN_ERRNO(auto links, DumpLinks());
for (const auto& link : links) {
if (link.type == ARPHRD_LOOPBACK) {
return link;
}
}
return PosixError(ENOENT, "loopback link not found");
}
PosixError LinkAddLocalAddr(int index, int family, int prefixlen,
const void* addr, int addrlen) {
return LinkModifyLocalAddr(index, family, prefixlen, addr, addrlen,
LinkAddrModification::kAdd);
}
PosixError LinkAddExclusiveLocalAddr(int index, int family, int prefixlen,
const void* addr, int addrlen) {
return LinkModifyLocalAddr(index, family, prefixlen, addr, addrlen,
LinkAddrModification::kAddExclusive);
}
PosixError LinkReplaceLocalAddr(int index, int family, int prefixlen,
const void* addr, int addrlen) {
return LinkModifyLocalAddr(index, family, prefixlen, addr, addrlen,
LinkAddrModification::kReplace);
}
PosixError LinkDelLocalAddr(int index, int family, int prefixlen,
const void* addr, int addrlen) {
return LinkModifyLocalAddr(index, family, prefixlen, addr, addrlen,
LinkAddrModification::kDelete);
}
PosixError LinkChangeFlags(int index, unsigned int flags, unsigned int change) {
ASSIGN_OR_RETURN_ERRNO(FileDescriptor fd, NetlinkBoundSocket(NETLINK_ROUTE));
struct request {
struct nlmsghdr hdr;
struct ifinfomsg ifinfo;
char pad[NLMSG_ALIGNTO];
};
struct request req = {};
req.hdr.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifinfo));
req.hdr.nlmsg_type = RTM_NEWLINK;
req.hdr.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
req.hdr.nlmsg_seq = kSeq;
req.ifinfo.ifi_index = index;
req.ifinfo.ifi_flags = flags;
req.ifinfo.ifi_change = change;
return NetlinkRequestAckOrError(fd, kSeq, &req, req.hdr.nlmsg_len);
}
PosixError LinkSetMacAddr(int index, const void* addr, int addrlen) {
ASSIGN_OR_RETURN_ERRNO(FileDescriptor fd, NetlinkBoundSocket(NETLINK_ROUTE));
struct request {
struct nlmsghdr hdr;
struct ifinfomsg ifinfo;
char attrbuf[512];
};
struct request req = {};
req.hdr.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifinfo));
req.hdr.nlmsg_type = RTM_NEWLINK;
req.hdr.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
req.hdr.nlmsg_seq = kSeq;
req.ifinfo.ifi_index = index;
struct rtattr* rta = reinterpret_cast<struct rtattr*>(
reinterpret_cast<int8_t*>(&req) + NLMSG_ALIGN(req.hdr.nlmsg_len));
rta->rta_type = IFLA_ADDRESS;
rta->rta_len = RTA_LENGTH(addrlen);
req.hdr.nlmsg_len = NLMSG_ALIGN(req.hdr.nlmsg_len) + RTA_LENGTH(addrlen);
memcpy(RTA_DATA(rta), addr, addrlen);
return NetlinkRequestAckOrError(fd, kSeq, &req, req.hdr.nlmsg_len);
}
} // namespace testing
} // namespace gvisor
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